Abstract
The paper describes the studies of ternary SnZn9Al1.5 lead-free alloy from the viewpoint of its mechanical behavior as well as microstructure
examined by the light and scanning electron microscopy. The authors focused their attention specifically on the fatigue parameters
determined by the original modified low-cycle fatigue method (MLCF), which in a quick and economically justified way allows
determination of a number of mechanical parameters based on the measurement data coming from one test sample only. The effect of the
addition of 1.5% Al to the binary eutectic SnZn9 alloy on its microstructure and the obtained level of mechanical parameters was analyzed.
The phases and intermetallic compounds occurring in the alloy were identified based on the chemical analysis carried out in micro-areas by
the SEM/EDS technique. It was shown that the addition of 1.5% Al to the binary eutectic SnZn9 alloy resulted in a more favorable
microstructure and consequently had a positive effect on the mechanical parameters of the alloy. Based on the conducted research, it was
recommended to use a combinatorial method based on the phase quanta theory to quickly evaluate the microstructure and the original MLCF
method to determine a number of mechanical parameters.
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